TGS Files 2025 Annual Report on Form 20-F

BUENOS AIRES, Argentina, April 22, 2026 /PRNewswire/ -- Transportadora de Gas del Sur S.A. ("tgs" or "the Company") (NYSE: TGS, MERVAL: TGSU2) announced that today it filed its annual report on Form 20-F for the fiscal year ended December 31, 2025 (the "2025 Annual Report") with the U.S. Securities and Exchange Commission (the "SEC"). The 2025 Annual Report can be accessed by visiting the Company's website at www.tgs.com.ar as well as on the SEC's website at www.sec.gov. In addition, shareholders may receive a hard copy of the Company's complete financial statements free of charge by requesting a copy from Carlos Almagro (calmagro@tgs.com.ar) or Leandro Perez Castaño (leandro_perez@tgs.com.ar) in TGS's Investor Relations Office at +(54-11) 3751-5100.

tgsisthe leaderinArgentina in the transportation ofnaturalgas,transportingapproximately 60%ofthe gas consumed in the country, through more than 5,700 miles of gas pipelines, with a firm contracted capacity of 89.4MMn3/d.Itisoneofthemainnaturalgasprocessors.Inaddition,tgs´infrastructureinvestmentsinVaca Muertabasinwillallowtogrowsignificantlyintheprovisionofservicestonaturalgasproducers,positioning tgsasoneofthemainMidstreamersinArgentina. tgssharesaretradedonNYSE(NewYorkStockExchange) and BYMA (Bolsasy MercadosArgentinosS.A.). The controlling company of tgsisCompañía deInversiones de Energía S.A. ("CIESA"), which owns 53.83% of the total share capital. CIESA's shareholders are: (i) Pampa Energía S.A. with 50%, (ii) Grupo Investor Petroquímica S.L. (member of the GIP group, led by the Sielecki family) and PCT L.L.C. with the remaining 50%.

/s/ Alejandro M. Basso
Alejandro M. Basso
ChiefFinancialOfficerand
ServicesVicePresident

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SOURCE TGS